Segal is a brilliant surgeon who worked at an East Coast university hospital before the administration blacklisted him for performing abortions, which were illegal at the time. He relocates to Las Vegas, where he takes a job as the in-house doctor at the hotel owned by Moe Greene and the Corleone Family. Despite his skillful hands and knowledge of anatomy, he is relegated to mostly performing abortions on Vegas showgirls and cocktail waitresses, many of whom Fredo Corleone recklessly impregnates. Despite his dedication to his work, Segal is a charismatic and attractive man who dresses informally. In 1950, he meets Lucy Mancini after she moves to Las Vegas following Sonny Corleone’s murder. The two begin dating and Segal discovers that Lucy has a pelvic malformation that causes her to have wide vaginal opening, making it difficult for her to orgasm during sex. He takes her to a skilled Los Angeles surgeon, Frederick Kellner, who fixes her problem. After the surgery, Jules marries Lucy. He later refers Michael Corleone to a facial surgeon who repairs the bone damage in Michael’s face that he sustained from McCluskey’s punch. In return, Michael makes Segal the head of a special hospital in Las Vegas. Segal also removes warts from Johnny Fontane’s vocal cords, saving his singing career.